Bahula Chauth is fasted on the Chaturthi of Krishna Paksha of Bhadrapada. This fast is observed by mothers to protect their sons. Items made of wheat and rice are prohibited on this day. The law of worshiping a clay statue of cow and lion is prevalent. This fast is also called Gau Pooja Vrat. Consumption of cow products is considered prohibited. It is believed that only the calves have the right over the milk of this cow. Fasting on this day gives the child of a child a child.
Bathing in the morning at the base of Bahula Chaturthi Vrat and wearing clean clothes should be done. If there is a cow in your house, then its place should be cleaned and its calf should be left with the cow. Ganesha, Gauri Mata, Shri Krishna and Gau Mata should be duly worshiped in the evening after fasting for the whole day. During the fast, the mantra of 'Om Namo Bhagwate Vasudevaya Namah' should be chanted.
There was a cow named Bahula coming back home to feed her calf. On the way home, he encountered a lion. Bahula is afraid of death but with enough courage she tells the lion that she has to feed her calf. Bahula tells the lion that once she lets him go, she will feed the calf and then come back, after which the lion can eat it. The lion freed him and waited for him to return.
Bahula returned after feeding his calf, which surprised the lion. He was greatly shocked and impressed by the cow's commitment to his child, so he freed her and let her return.
It shows that the physical strength, anger and passion of the lion also had to be bowed down to the care and love of the cow towards its calf. From that particular day, devotees sacrifice cow's milk and save it only for calves and celebrate Bahula Chaturthi. It is a symbol of worship that is performed to get blessings from the gods.